Casing-perforator.



E. A. HARDISON.

CASING PERFORATOR.

APPLICATION FILED DEC. 11, 1910.

' 1,004,782. 1 Patented 001.3,1911.

TnI/enwr 02am flflardz'aan/ zz/izrzasses E yff; flnmfim Z/w/ JA-A 0% 1EDWIN A. HARDISON, OF BAKERSFIELD, CALIFORNIA.

GASING-PERFORATOR.

Specification of Letters Patent.

Patented Oct. 3, 1911.

Application fi1ed. December 8, 1910. SeriaI No. 596,366.

and strength of parts.

The accompanying drawings illustrate the invention. 7

Figure 1 is an elevation of a casing perforator constructed inaccordance with this invention and lowered inside a well-casing, afragment of which is shown. The body and a portion of the mandrel areshown in vertical mid-section and the cutters are retracted. Fig. 2 isan enlarged inverted plan section of the body at the horizontal plane ofthe axes of the cutters. The cutters are shown intact. The well-casingis also shown in cross section. Fig. 3 is an elevation of a portion ofthe mandrel and body:

mainly in vertical mid-section and in the scale of Fig. 2. The cuttersare shown partly extended through the casing a fragment of which isshown. Fig. 4. is a plan section on the scale of Figs. 2 and 3 on ahorizontal plane indicated by m, Fig. 3, just below the cutters. Thecasing is omitted from this view. Fig. 5 is an elevation of a fragmentof the mandrel viewed from the right of Fig. 3. l

The tool body 1 is provided with a longitudinal mandrel-way formed by anaxial bore 2 terminating at the lower end in a reduced guide orifice 3,and is provided with oppositely arranged lateral, horizontal, radialcutter ways 1 which communicate with the mandrel-way and with radialrecesses 5 and slots 6 in the body.

The cutters 7 are provided with pins .8 that play in the recesses andslots to hold the cutters from turning and also to receive the ends ofsprings 9 which are fastened by cap screws 10 in the slots 6 and operateto normally retract the cutters.

The cutter bodies and the ways therefor are preferably cylindrical andthe cutter blades 11 are preferably arranged vertically and are abovethe level of the pins 8- which are set in holes bored in the under sidesof the cutter bodies.

In the top of the tool body 1 a latch seat 12 is provided to receivealatch pin 13 which is provided with an enlarged head 14 and is normallycarried in the mandrel 15 which has a taper portion 16 to contact withthe cutters to force them out against the pressure of the springs 9 tocut the casing 0 when the mandrel is moved downward relative to thebody.

The mandrel is provided with a slot-like latch chamber 17, and springchamber 18 and with a way 19 between the spring chamber 18 and the latchchamber 17 to accommodate the latch stem 22 which may be a bolt screwedinto the body of the latch and provided with a head between which andthe end wall of the latch chamber is seated the latch spring 23 tonormally retract the latch into the latch chamber.

The mandrel stem 24: extends down through the guide orifice 3 at thelower end of the body 1 and through the top loop 25 of the frictionalbody support 26 which comprises a bar 27 provided with semi-ellipticfriction springs 28 that are oppositely mounted on the bar and securedat the upper ends by the bolt 29 passing through the bar and the upperends of the springs and are connected at their lower ends with a collar30 in slidable relation with the bar and adjustable thereon by means ofa nut 31 screwed onto the lower end of the bar; there being tensionsprings 32 mounted on pins 33 at the center of the friction springswhich are also held bowed out by the adjustment of the collar on thebar. The loop 25 is hinged to the top of the bar by a bolt 34 and isslidable on the mandrel stem 24 on which it is held by the nut 35.

The mandrel is provided at its upper end with the usual pin 36 to engagethe box, not shown, of an ordinary sub.

In practice when it is desired to use the tool, the friction support 26will be inserted into the casing and the body 1 will be let down ontothe top of the support loop 25 and the latch will be drawn out from themandrel and allowed to enter its seat 12 within the body. The string oftools thus arranged will be lowered in the casing 0 until the body hascome to the level at which it is desired that the lowest perforationshall be made. Then the tools are operated to draw the mandrel up untilthe latch is withdrawn from its seat; whereupon the latch springretracts the latch into the mandrel. Then the mandrel is lowered whilethe body is supported by the loop 25 and thereupon the tapered walls ofthe mandrel operate to force the cutters out in opposite directions thusmaking a horizontal row or ring of perforations in the casing. Then themandrel will be drawn up in the casing and the nut 35 at the lower endthereof will engage the loop, thereby lifting the body 1 and thefriction support until the cutter is brought to the level at which it isdesired to make the next row of perforations. Thereupon the mandrel islowered again and a row of perforations is cut as before; and so onuntil the casing is perforated as desired In case any portion of thecasing is difficult to perforate, the mandrel may be raised and loweredto strike the cutters with a blow; and jars, not shown, may be employedif desired, to increase the blow delivered to the cutters so that thecutters may in any instance be driven through the casing as required.

The nut 35 at the lower end of the mandrel may be held in place by acotter pin 37 extending through the nut and through the lower end of themandrel thus to prevent accidental displacement.

In the drawings four cutters are shown but it is understood that a feweror greater number of cutters may be employed without departing from themain features of the invention.

I claim 1. A well-casing perforator comprising a body provided withoppositely arranged lateral ways, cutters horizontally slidable in saidways, resilient means to retract the cutters, a taper mandrel inside thebody and in slidable relation thereto and to said cutters for thepurpose of forcing the cutters out, a latch releasable by retraction ofthe mandrel and adapted to support the mandrel in the body, meansslidable in the casing and movable in longitudinal relation to themandrel and the body to support the body in the casing and means on themandrel to support the body-supporting means.

2. In a well-casing perforator, the combit-ion with a hollow bodyprovided with a lateral way, of a cutter slidable transversely in saidway, resilient means to retract the cutter, a taper mandrel in the bodyto force the cutter out, therebeing a.seat in the top of the body, alatch in the mandrel adapted to be extended from the mandrel to engagethe seat, means to retract the latch, means slidable in the casing tosupport the body in the casing and means whereby the mandrel supportsthe supporting means of the body.

3. In a casing perforator the combination of a body provided with anaxial bore and also provided in its top with a latch seat, cutters inthe body, a mandrel in the bore to operate the cutters, said mandrel.being provided with a latch chamber, a latch pin in the chamber adaptedto enter the latch seat and provided with an enlarged head, a bolt inthe latch head, and a spring in the mandrel to retract the bolt to drawthe latch into the mandrel.

4. In a casing perforator the combination of a bar; semi-ellipticsprings fastened at one end to the bar; a collar in slidable relationwith the bar and fastened to the other end of the springs; means toadjust the col lar on the bar; a loop fastened to the top of the bar; abody above the loop provided with a longitudinal way; a mandrel in saidway extending below the body and through the top of the loop; means tosecure the mandrel against withdrawal from the loop and to allow play ofthe loop along the mandrel; cutters in the body; said cutters andmandrel being in relative arrangement so that downward movement of themandrel relative to the body will operate the cutters, and means tooperate the mandrel in the body.

5. In a casing perforator the combination of a bar; semi-ellipticsprings fastened at one end to the bar; a collar in slidable relationwith the bar and fastened to the other end of the springs; means toadjust the collar on the bar; a loop fastened to the top of the bar; abody above the loop provided with a longitudinal way; a mandrel in saidway extending below the body and through the top of the loop; means tosecure the mandrel against withdrawal from the loop and to allow play ofthe loop along the mandrel; cutters in the body, said cutters andmandrel being in relative arrangement so that downward movement of themandrel relative to the body will operate the cutters; means to operatethe mandrel in the body, and means to temporarily hold the mandrel frommoving to operate the cutters.

6. In a casing perforator the combination In testimony whereof, I havehereunto set with the body and cutters, of a mandrel to my hand at LosAngeles, California, this 2d operate the cutters, a bar carried by theday of December 1910. mandrel, semi-elliptic springs on the bar EDWIN A.HARDISON. to engage the casing and support-the body, In presence of andspiral springs between the bar and the JAMES R. TOWNSEND,

middle of the semi-elliptic springs. L. BELLE RICE.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of latencs, Washington, D. G.

